Found 91 talks archived in Telescopes and instrumentation
In recent years, many countries throughout the Middle East - in particular the more prosperous states - have made great progress in education, higher education, and scientific research. However, this has not often been matched by equivalent progress in astronomy and its related fields, despite the fact that many nations in the region consider astronomy a fundamental part of their cultural and scientific heritage. The current status of astronomy in the individual countries of the Middle East will be reviewed. The positive decision of the International Astronomical Union (IAU) (Commission 46) to take a proactive role through visits and consultancy in the region will also be discussed, including the founding of MEARIM - the Middle East and Africa Regional IAU Meeting (first meeting held in Cairo 2008). The challenges and proposals to move forward teaching and research in astronomy in the Middle East will be considered, with comments relating North African countries and new trends, including space research along with astronomical activities.
3C 279, the first quasar discovered to emit VHE gamma-rays by the MAGIC telescope in 2006, was re-observed by MAGIC in January 2007 during a major optical flare and from December 2008 to April 2009 following an alert from the Fermi space telescope on an exceptionally high gamma -ray state. The January 2007 observations resulted in a detection on January 16 with significance 5.2 sigma, corresponding to a F(> 150 GeV)(3.8±0.8) 10^-11 ph cm-2 s-1 while the overall data sample does not show significant signal. The December 2008 - April 2009 observations did not detect the source. We study the multi-wavelength behaviour of the source at the epochs of MAGIC observations, collecting quasi-simultaneous data at optical and X-ray frequencies and for 2009 also gamma-ray data from Fermi. We study the light curves and spectral energy distribution of the source. The spectral energy distributions of three observing epochs (including the February 2006, which has been previously published in Albert et al. 2008a) are modelled with one-zone inverse Compton models and the emission on January 16, 2007 also with two zone model and with a lepto-hadronic model. We find that the VHE gamma-ray emission detected in 2006 and 2007 challenges standard one-zone model, based on relativistic electrons in a jet scattering broad line region photons, while the other studied models fit the observed spectral energy distribution more satisfactorily.
CANARY is a technical demonstrator for the proposed EAGLE instrument for European ELT. EAGLE will have twenty Integral Field Units patrolling a 5 arcminute field and requires a new form of adaptive optics to provide the required image quality for its 0.0375 arcsec image sampling: Laser Guide Star Multi-Object AO. This entails several significant technical innovations: open-loop control, atmospheric tomography, and new calibration methods. The CANARY demonstrator is currently in its first, natural guide star, phase, and the first results have been obtained on sky. CANARY Phase A is described and the first results are presented. The next, laser guide star, phase is then outlined.